Residents who live near fracking sites have been concerned about the quality of their water supplies after the procedure takes place. Now, adjacent to the biggest shale field discovered in Texas, the Eagle Ford formation, well owners are anxious about the very existence of a water supply. Those who live nearby the fracking sites report that their wells and filters fill up with sand, an element used in the drilling process, every few days. And since fracking requires millions of gallons of water, residents near Eagle Ford worry that without any rainfall, their underground supplies will be sucked dry.